Armature for dynamo-electric machines or electric motors



(No Model.) 2 Sheets-Sheet 2.

- W. K. FREEMAN.

ARMATURE FOR DYNAMO ELEOTRIO'MAGHINES 0R ELECTRIC MOTORS.

No". 270,777. Patented Jan.16,188-3.

1 UNITED STATES PATENT OFFICE.

WALTER K. FREEMAN, OF BROOKLYN, NEW YORK, ASSIGNOR TO W. F. JOBBINS, OF EAST ORANGE, NEW JERSEY.

ARMATURE FOR DYNAMO-ELECTRIC MACHINES 0R ELECTRIC MOTORS.

SPECIFICATION forming part of Letters Patent No. 270,777, dated January 16, 1883.

Application filed June 15, 1882. (No model.)

To all whom it may concern.

Be it known that I, WALTER K. FREEMAN, a citizen of the United States, and a resident ofBrooklyn, New York, have invented certain Improvements in Armatures for Dynamo-Electric Machines or Electric Motors, of which the following is a specification.

My invention consists in certain improve ments in the construction of rotary arinatures for dynamo-electric machines and electric motors, as more fully described hereinafter.

1n the accompanying drawings, Figure 1 is a side view, partly in section, of my improved armature-core partially fitted; Fig. 2, a transverse section, and Fig. 3 a perspective view of one of the segmental plates of which the core of the armature is partly made up.

A is the shaft of the armature, on which is keyed a. hollow cylindrical drum, B, of brass, having a series ofholes, I), cut through it, preferably at an angle. as shown, or of such a shape and in such a position as not to allow parts of the segments, hereinafter described, to slip into them out of position.

On each end of the drum is formed a screwthread for the reception of a ring, D, of cast-iron, provided with radial teeth at d, which project some distance outward beyond the end of the drum in the direction of the line of the shaft,

as shown in Fig. 1. After one of these cast-. iron toothed rings D has been screwed onto one end of the drum, there are slipped on from the other end a series of sheet-metal segments of rings, E, Fig. 3, each segment being greater than a semicircle, so that when placed on the drum it will stay in position as readily as a complete ring. I prefer to make thesegnal grooves F, in which the coils of covered.

wire may be wound in any desired way, the projecting teeth on the rings D forming cor responding guide-notches at each end of the drum. The segments E are put on the drum so that the portions of the rings cut away to form the segments shall not be in line, but shall be arranged irregularly or regularly on different parts of the drum. However they may be arranged, they will allow more or less air to pass from within the hollow drum through the openings 1), and the spaces formed between the ends of the segments and between the coils as the armature revolves.

I claim as my invention-' 1. An armature-core consisting of a drum fitted with a series of sheet-metal segments of rings, each segment beinggreater than a semicircle, substantially as described.

2. An armature-core consisting of adrum fitted with a series of sheet-metal toothed segments of rings, each segment being greater than a semicircle, and retaining-rings secured to each end of the drum.

3. An armature-core consisting of a hollow perforated drum fitted with a series of sheetmetal segments of rings, each segment being greater than a semicircle.

4. The combination ofthe brass drum mounted on the shaft with toothed sheet-metal segments of rings, each larger than a semicircle, and cast-iron toothed rings secured to each end of the drum, substantially as set forth.

In testimony whereof Ihave signed myname tothis specification in the presenceof two subscribing witnesses.

WALTER K. FREEMAN.

Witnesses JOHN H. KATTENSTROTH, HUBERT HoWsoN. 

